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发明名称
An aseptic telephone mouthpiece
摘要
申请公布号
GB356986(A)
申请公布日期
1931.09.17
申请号
GB19300032470
申请日期
1930.10.29
申请人
REGINALD POWELL HEAVISIDE WHITMARSH
发明人
分类号
H04R1/12
主分类号
H04R1/12
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代理人
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